Ing works



H. SLATER.

AUTOMATIC CHANGE VALVE FOR PRESSES. APPLICATION FILED JAN.25. 1917.

1 221,856. Patented Nov. 18, 1919.

WITNESSES l/VVETOR A TTOR/VEYS nnrrnn sTATns rnrnnr enrich HARVEYSLATER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 CHARLES IE. ELMES ENGINEER-ING WORKS, OF CHICAGO, ILLINOIS, A CORPORATION 0L? ILLINOIS.

A'lJ'TOMATIG CHANGE-VALVE FOR PRESSES.

i,s21,s5e. Specification of Letters Patent. Patented Nov. is, rare. 7

Application filed January 25, 1917. Serial No. 144,568.

low to a high pressure feed, in supplying fluid pressure to pressureactuated machines such as the hydraulic pressure used to extract liquidsfrom solid bodies; j v

With one form of such machine it is usual to admit pressure thereto andto control the admission by means of a valve designed to admit thedifierent pressures successively, first by admitting a relatively lowpressure, say about 500 lbs. per square inch and, when a certaincompressive action has been obtained on the material in the machine tochange automatically so as to admit a relatively high pressure, sayabout 5000 lbs. to

the square inch. The valvular devices of this type as heretoforeconstructed have contained a multitude of tortuous passageways, valvesand other parts both movable and stationary which have not onlynecessitated a high cost of construction, but have necessitated the useof cumbersome casings and expensive packing joints in order to in sure anon-leaking condition under the high pressures usual in devices of thischaracter.

Accordingly, one of the objects of this invention is to provide anautomatic high and low pressure control valve which. will be ofsimplified construction, in which the usual tortuous passageways havebeen el1m1- nated and replaced by straight bores and at the same timethe device as a whole is constructed so that necessarily removable partsare designed and assembled to attain a highly efiicient valve of theclass described but formed of relatively few parts and with the leastpossible use of material.

A further object of the invention is to provide a construction 7including a valve containing casing arranged with the least possiblenumber of openings thereto to minimize the possibility of leakage andarranged so that the several demountable elements maybe readily removedfor cleaning or repairing.

Various other objects and advantages of the invention will be in partobvious from an inspection of the accompanying drawings and in part willbe more fully set forth in the following particular description of oneform of mechanism embodying my invention, and the invention alsoconsists in certain new and novel features of construction andcombination of parts hereinafter set forth and claimed.

In the drawingsthe figure is a longitudinal sectional view through apreferred form oi my invention particularly adapted for extreme highpressure.

There is shown a hollow casing 1 in the form of a rectangular block theseveral parts oi' which will be hereinafter referred to as shown in thedrawing for the purpose of facilitating the location of the parts in thefollowing description. The block is provided' with a verticallyextending bore 2 the upper end of which is enlarged and internally screwthreaded as shown at 3. An inserthas its lower end threaded into thisenlarged portion and acts as a removable closure for the upper end ofthe bore. The insert includes a sleeve 5, the lower portion of which isexternally threaded to engage the thread 3 and which projects beyond thetop or the casing 1. The sleeve is provided wlth a bore 6, the lowerportion oi which is smooth and constitutes abearing for an ens largedcylindrical plunger 7 constituting part of a change pressure valve. Theupper portioncf the valve is provided with a reduced stem .8 which isguided in a bore 9, in a sleeve 10 which is threaded into the upper endof the bore 6 and held in adjacent action on the valve of the fluidthrough the high pressure inlet, and greater than the val e unseatingpressure of the normal pressure through the-10w pressure inlet buthaving less tension than the combined pressures from the high and-lowpressure inlets-When supplemented. by a any reactory pressure throughthe machine supply port.

A gland packing p is disposed:betweeintlie a casing 1, the shell 5 andthe plunger 7. The

lower end of the plunger lSTGdUCGClntO115011111 surefiuid supply and theopposite opening 17' constituting the machine supply port which issimilarly tapped and adapted to be connected to a hydraulic press orother ma chinecontrolled by this valve. The casing,

is bored transversely of the length-of the bore 2 and coasts therewithto provide'a low pressure passageway 18 directly connecting theinlet-16' with the port 17. i

A demountable valve seat 19' of a size to be inserted through-the borewhen the insert 5 isdemounted, is removably' mounted in threadedengagementwith the lower portion of the bore 2 adjacent'thelpassageway.18.

The seat is provided with a centrally disposed and reduced passageway20,the :upper end of which as countersunk to form at frustosconicalseat. for the friisto-conical end 15"of the changcvalve. Theup per endof the seat projecting into thepassagewayls is materially enlarged toprovide a massive head 21 the. lower portion of which is defined by aninclinedperipheral shoulder 22 designed, .when the seat isscrewed-firmlyin place, to rest onthe countersunk.portion 23 of the.bore2. The head ,of the valve. seat a is provided with .wrenchho1es2-1by means of which the seat: maybe screwed into ad justableip ositionlrThe portion'of the bore below the valve seat. opens through a side port25uand' constitutes. anvinletx for the high pressure supply.- The lowerend of the bore 2 is closed by means of a deinountableinsert 26 screwedinto the same Thisilnsertxnn eludes a sleeveQZ threaded into theenlargedlower-send of. the .bore and contains-a screw valve. 28 .pr ovided witha conical head 29 ien- 'a 'in xin athelOwenend.of the assa 'ewa r b b b20 in. the seat to regulate the high pressure flowdnto the passageway 18when the, valve change head 15 is unseatedz- The lower end of th'eivalve2S prO ectsbeyOnd the outlines of the easing and the sleeve 27; and isprovided: with a square head 30by means-of which the valve may beengaged by a suitable tool so as to move the head 29 to and 7 from itsposition engaging the lower end of the-valve seat 19;

In operation, it will be understood that the low--pressure is admittedto the device and controlled'by any suitable means such as a hand valvein the low pressure supply pipe-land thefiaidunder low pressure willmove along the passageway 18 and across thexvalve extension 14practically without interruption and directly to the machine throughtheport 175 This flow will continue until the actuation of the machinecauses a reactory pressure therefrom to act on the large surfaceprovided by the head of the plunger 7. This increase of pressure actingon the large area of the plunger will cause thevalve 15 eventually tounseat thus opening the high pressure inlet to the machine part."

Should itbe desired to control the high pressure fluid duringtheactuation of the machine while under the high pressure, the valve '28can be ad usted to or from its seat,

[or the valve may be even closed on to the seat when it isdesired to;intercept the high pressure flow to them achl'ne.

On releasing the pressure in the passage way,'the spring willfreassertitself and act on the changevalve automatically to shut offthelnglrpressure fluid through the valve seat. Tlns'will leave thedevice merely in I position with the low pressure actingon the machineand thisllo'w pressure may be controlled by any approved means distinctfrom the deviceherein disclosed.-

By' means of a device of this character it is possibleto form the changevalvular mechanisnnof a simple block or cylinder drilled transverselytoprovide the low pressure passageway to the machine supply port anddrilled, vand 'countersdrilled longitudinally to provide for thehousinglof the inserts at opposite ends of the block or cylinder.This'formof construction necessitates merely straight line drilling andthe use of ordinary threading. machines to threadthe; drilled boresisothat this device may belconstructedvwithout the necessity of expensivecastings ;or special 1 machines.

The parts mostly-subjected to wear are the valve. seats-and coacting-.ValveS, but in the device disclosed ttheseparts :may be made readilyreplaceable so that when worn,

others be, substituted and this substitu tion maybe provided inerelyibyunscrewing the ansert: and positioning-v the valve seat in positionthrough one of the openings. so providedi It is obvious that the tensionon the spring may be readily: adjusted from the outside of the casingmerely by rotating the projecting portionoftheadjustingsleevein one orthe other directionaccording as the tension is desired to be increasedor decreased. The valve seat may be adjusted in position towa-rd andfrom either of the valves engaged thereby.

As there are but four openings in the solid easing it is obvious thatthe possibility of leakage has been reduced to a minimum.

While I have shown and described, and have pointed out in the annexedclaims, certain novel features of my invention, it will be understoodthat various omissions, substitutions and changes in the form anddetails of the device illustrated and in its opera tion may be made bythose skilled in the art without departing from the spirit of theinvention.

Having thus described my invention, I hereby claim:

1. A valvular device including a hollow casing having a straight boreextending therethrough from end to end, an insert threaded into one endof said bore, said insert including a sleeve provided with a boreconstituting a plunger bearing, a change pressure valve including aplunger slidably mounted in said bearing, a spring-tensionadjustingmember threaded into the sleeve bore, a coiled spring housed within thesleeve bore and bearing on said last named member and on said plunger,the inner end of said plunger being reduced to form a valve head, saidcasing provided with a pair of openings extending through the sidethereof and opening into the casing bore at said valve head to provide alow pressure passageway connecting said openings, one of said openingsconstituting a low pressure inlet and the other opening constituting amachine supply port, a valve seat removably mounted in engagement withsaid casing bore, facing said low pressure passageway and provided witha high pressure passageway extending therethrough, said high pressurepassageway normally closed by said spring pressed valve head, saidcasing provided with a side port opening to the casing bore to theoutside of said valve seat and constituting a high pressure inlet and aninsert for closing the end of the casing bore to the outside of saidside port.

2. A. valvular device including a hollow casing having a straight boreextending therethrough from end to end, an insert threaded intoone endof said bore, said insert including a sleeve provided with a boreconstituting a plunger bearing, a change pressure valve including aplunger member mounted in said bearlng, a spring-tensiorn inlet and theother opening constituting a machine supply port, a valve seat removablymounted in engagement with said casing bore, facing said low pressurepassage way and provided with a high pressure passageway extendingtherethrough, said high pressure passageway normally closed by saidspring pressed valve head, said casing provided with side port openingto the casing bore to the outside of said valve seat and constituting ahigh pressure inlet, an insert for closing the end of the casing bore tothe outside of said side port, said last named insert provided with avalve for regulating the high pressure flow from said side port throughsaid high pressure passageway in the valve seat when said spring pressedvalve is ofl its seat.

Signed at Chicago in the county of Cook and State of Illinois thiseighteenth day of January A. D. 1917.

HARVEY SLATER,

Witnesses:

M. MERKLENBURN,

F. A. Rona.

